Roof cover

ABSTRACT

The invention concerns a roof cover comprising a synthetic plastic sealing membrane ( 12 ) and several synthetic plastic bars ( 13 ) arranged parallel to one another on the surface of the sealing membrane. The latter is mechanically fixed to a roof element ( 11 ) and each of the bars ( 13 ) consists of a single-piece synthetic plastic section, soldered on the sealing membrane ( 12 ).

FIELD OF THE INVENTION

The present invention relates to the installation of coverings forbuildings; in particular, it relates to a novel roof covering.

PRIOR ART

Roof coverings are normally formed using sheets of zinc with buttjoints. These zinc coverings have the disadvantage that they expand withheat and become fragile under conditions of severe cold. Moreover, thezinc sheets have to be ventilated from below so as to avoid abnormalageing. Finally, zinc coverings can only be fastened to timber boards.

DE-A-23362229 and U.S. Pat. No. 5,572,843 disclose roofing systems inwhich a sealing membrane of synthetic material is spread over the roof,said membrane being secured by means of flat bars or section members ofsynthetic material. However, these bars or section members do not impartto a roof covered in this way an aesthetic appearance similar to that ofa conventional zinc roofing.

SUMMARY OF THE INVENTION

The invention proposes a system for covering a roof, comprising asealing membrane of synthetic material and a plurality of bars ofsynthetic material arranged parallel to one another on the surface ofthe sealing membrane. The latter is mechanically secured to a roofingelement and each of the bars comprises a section member in one piececonsisting of synthetic material welded to the sealing membrane. Thebase of each section member is welded to the sealing membrane 12 usingany suitable process.

In a preferred embodiment each section member is formed with a base anda projecting web surmounted by a portion which has profile of generallytriangular shape having a rounded crest.

In addition to making it possible to provide roof coverings which do nothave the drawbacks of zinc coverings, the roof covering according to theinvention also has the following advantages:

(i) the roofing can be effected more easily and more rapidly than zincroofings with butt joints;

(ii) large choice for the covering support;

(iii) reduction in the cost of the roofing in relation to a zinccovering with butt joints;

(iv) the appearance of the covering is substantially similar to that ofa conventional zinc covering.

The invention will be described in more detail below with reference tothe accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view from above of a roof surface covered in accordance withthe invention;

FIG. 2 shows a section along the line II—II in FIG. 1;

FIG. 3 is an enlarged view of a section member illustrated in FIG. 2.

DESCRIPTION OF THE EMBODIMENT OF THE INVENTION

A uniform sealing membrane comprising sheets 12 of PVC, for example, issecured mechanically using any means on to the surface of a roof element11, for example an insulating material, battening, concrete, a metalsheet, etc.

Section members in one piece 13 of synthetic material are fitted on tothis membrane 12, for example flexible PVC section members disposedparallel to one another at a regular distance apart. The section members13 are secured to the membrane 12 by welding, for example by coldwelding using tetrahydrofuran or by hot air welding.

In the example illustrated in FIG. 3, the section members 13 comprise abase 14 and a projecting web 15 surmounted by a portion 16 having across-section of generally triangular shape. The web 15 of the sectionmember has, for example, a width of approximately 1 cm and a height ofapproximately 3 cm. In the embodiment shown in FIG. 3 the sectionmembers 13 are fastened in the overlapping zone of two consecutivesheets of PVC 12, which has the effect of rendering the jointsinvisible. The appearance of a roof covering formed in this way in asimple and rapid manner is similar to that of a conventional roofcovering.

What is claimed is:
 1. A system for covering a roof, comprising asealing membrane (12) of synthetic material and a plurality of bars (13)of synthetic material arranged parallel to one another on the surface ofthe sealing membrane, characterised in that the sealing membrane (12) ismechanically secured to a roofing element (11) and each of the bars (13)comprises a section member in one piece consisting of synthetic materialwelded to the sealing membrane (12).
 2. A system for covering a roofaccording to claim 1, characterised in that each section member (13) isformed with a base (14) and a projecting web (15) surmounted by aportion (16) having a cross-section of generally triangular shape.
 3. Asystem for covering a roof according to claim 2, characterised in thatsaid portion (16) has a rounded crest (17).
 4. A system for covering aroof according to claim 2, characterised in that the base (14) of eachsection member (13) is welded to the sealing membrane (12).
 5. Thesystem for covering a roof according to claim 2, characterized in thatthe base (14) of each section member (13) is welded to an overlappingzone of two consecutive sealing sheets or strips (12) of said sealingmembrane.
 6. A system for covering a roof according to claim 3,characterised in that the base (14) of each section member (13) iswelded to the sealing membrane (12).
 7. The system for covering a roofaccording to claim 3, characterized in that the base (14) of eachsection member (13) is welded to an overlapping zone of two consecutivesealing sheets or strips (12) of said sealing membrane.
 8. The systemfor covering a roof according to claim 1, wherein said sealing membraneis flat and is secured directly to the roofing element, and wherein eachsaid section member is welded directly to said sealing membrane.